Rear tool



G. D. SUNDSTRAND REAR TOOL Oct.` 27 1925. 1,559,296

Filed April 30, 1919 Patented Oct. 27, 1925.

UNITED STATES PATENT 'ori-funi.

GUs'rAr DAVID sUNn-sTRANn, or Rockman, ILLINoIs, AssIGNoB. 'ro RocKFonnTooL COMPANY, or RocKroRD, ILLINoI-s, A CORPORATION or ILLINOIS.

, VIman TooL.

Application med Apn 3o,

Be it known that I, GUs'IAF DAVInSUND- STRAND, citizen ofthe UnitedStates, residing at Rockford, :iin the .county of VVinnebago and Stateof Illinois,have invented certain (new and useful Improvements in RearTools, of. which-the following is a specificationV` w.

- My invention relates to -lathespandimore especiallyto an,vimprovedreartool for lathes, especially vadapted for automaticactuation. A f 4One ofthe objects' of-myy invention isto provide for theautomatic operation of the rear-tool by motion of the fronttoolcarriagesimultaneously with the operation.,- of the front tool. r w :v'f

rAnother object isto Aprovide vforgsmall adjustn'ients of thereartool'botlralonglthe lathe bed and across it,-to compensate forvariations in the stock, Wear of `the tool, etc., quickly and Withoutdisturbingthe'ad-y justment of tlie'automatic connections.

Anotherobject is to providev in additionV tothe automatic actuatingmeans', manual means for operating the lrear tool at vany time.-k

Still another object' is to provide a particularly strong powertransmission fork the feed of the rear tool, capable of withstandingheavy shocks and stresses.

Other objects"y and advantages-ofthe invention will be 'apparent as thedescription proceeds. -1 In the accompanying drawings'- f `f AFigure-"1is an end view, l v I Fig. 2 is a rear Aside elevation of the tool,

F ig. 3 isa section of a lathe'bed'and the tool mountedfthereon, andA 14- is a detail view of one of tlief-cams used to guide the tool.

" In.l the embodiment of the invention selectedfor illustration, is themain frame of my improved rear tool.- It is mounted for longitudinalmovement along-Ways 11 and 12 of the lathe'bed 15' and `its upper partterminates in a gudeWay-l in which is mounted a transverse Slide member17 carrying a longitudinally slidable 'tool support 18V on' which `ismounted any suitable tool holder 19 holding the tool 2 The main frame'10`maybe clamped .in any vdesired positionby any suitable means,

as, for example, a plate 21 engaging the un-V der side of Ways 11 and 12and forced into 1919. Serial No. 293,868..

binding engagement thereyvith by suitable l bolts 22.` Asecondlongitudinal adjustment ofthe tool may beobtained by-sliding thetoolvsupport 18 on the transverse slide 17. The means herein shown formaking this adjustment comprise a `pinion 23engaging a-rack on the rearside of the support 18 and rotated by means of a handle 24. A suitableclamp 25 locked by handle 26 may be .usedvto holdtlie tool support 18 inadjusted position. w

The slide Vmember 17 is adapted to be fed toWardithe center line of the.lathe'either automatically or manually.'` 1A' rack bar 27 havingalrack`32 projects from thebottom of the transverse slide 17 and mesheswith a pinion 33 lfreely-. rotatable on a shaft. 34 mounted inthe mainframe 10.

' The rack bar v27: Sis `slidably Amounted `in` a groove inthe bottom ofslide `17. A down- Wardly projectingfapronj suitably at-v tached,las-by` screws l5() 'at'.tlie rear end of the slide carries a rotatablymounted' threaded member 3G enteringa threaded aperture in the rack bar.and restrained from endwise movement by collars 37. To limit the for-Wardvr motion of thel transverse` slidek 17 a kstop pin`38 may'be'adjustably mountedon the apron` 35. As shown, `fthe stop pin' istl'irea'ded through the apron and abuts against themain frame 10topreventimovementV toward the frontV beyond?. any desired pointf f 1 I Aspringtension'pin 28 lprojecting from 'the'bottom of the .raclrviba'r27reciprocates in atubular aperture 29 in the -maiIi frame 1 0, saidaperturey being 'suitably-slotted to allow the pin thedesired -amountoftravel. Ac'ompressionspring 30 lies partly Within v-the unslo'ttedportion of the apert`ure`29 and presses the pinto the rear, or away fromthe center line of the 'machinef A plug 31 in the threadedfend oftheaperture 29V permits easy removal of the spring and alsov adjustyment oflits tension.

A transversely slidabletransmission'member 39 1s mounted' 1n the mainframe v10.

lThis member has a rack 40 along the upper side of its rearmost portionmeshing With the -pinio1i-g33, a downwardly yprojecting bracket 4:1 atits central portion, and a cam roller 4 2 atits front end.-l

- VThe front tool carriage 49 is mounted on `Ways 1 3 and 111iy formedon the bed 15, and may be equipped With the usual tools and'adjus't- Yslot 52.

The cam illustrated has a vertical flange 44`engaging the rear face ofthe' fronttool carriage 43 and a. horizontally projecting cam flange 45.

1t will be' seen upon reference tol Fig. 3 that Ways 13 and 14 are at ahigher level than Ways 11 and 12 and also that way 13 is directly overWay 12. Among other ad` vant-ages, this arrangement results in aconvenient location for the cam 43 Where its horizontally projectingflange' 45 engages with the eam roller 42. The horizontal cam flangeshown has three sections, a section 46 parallel cam, a second section 47inclined thereto, and a third section 48 parallel to the first.

1t will be seen that as the front tool carriage moves toward thc'headstock and past the stationary frame of the rear tool, the cam roller 42Will be maintained in engagement With the cam by the pressure of thespring 30. The first parallel section therefore, represents a spacethrough-'Which the front tool carriage will move Without producing anymotion of the rear tool. lWhile the inclined section passes by the camroller, theroller and the main transmission mem` ber 39 will be forcedback, rotating the pinionV 33 and forcing the slide 17 and' the cuttingtool'2() forward against the material. l/Vhen the third section isreached, motion of the rear tool ceases. During all three of theseperiods the front tool may continue uniformly machining` a smoothcylinder from the material on the lathe. 4

The above series of steps defines a simple cutting ofi" .orshoulder-forming operation by the rear tool 2G. It is obvious that thetiming of this operation with respect to the movement of the front toolcan be readily adjusted by shifting the cam, and that any number ofcamsv may be designed to performV similar operations at varying rates ofspeed. By the use of rear toolsl of special design a` large variety ofvariously shaped articles may be produced'.v

, lith a given cam installed the limits of the motion produced by it mayalso be readily adjusted in a. transverse direction by adjustment oflthe rack 32y with respect to the slide 17 without disturbing. the cam.rllhe third section 43 ofthe cam 43 is al- 'ivays made long enough tolremain in contact with roller 42 While the operati-ou the with thedirection of motion vof the machine is performing is being entirelyoompleted.

Any suitable hand-feeding mechanism, such, for instance, as thatdescribed and illustrated in my co-pending application, Serial No.212,393, hereinabove referred to, may have engagement With thedownwardly projecting bracket 41 for manual operation of the rear toolat any time more particularly when a cam 43 is not in use. The manualcontrol is also useful in making a mark on the stock from Which tomeasure for preliminary adjustments of the front tool before starting acut, Whether cam 43 is being used or not. Stop pin 38 is intended foruse primarily When caml 43 is not used toL secure uniformity in the Workwhen the tool is manually operated.

Vhile theV embodiment of my invention above described is particularlyefficient in handling large numbers of' small parts requiring asurfacing cut to be followed by the cutting of grooves or shoulders, orthe complete cutting off of a piece of stoclr, it is obvious that themechanisms disclosed are useful nin other and more general applications,with or Without modifications such as Would naturally be suggested bythe nature of the Work to be done.

I claim as my invention:

1. In a lathe, in combination, a rear tool carriage, a rear tool on saidcarriage, a front tool carriage movable past said rear tool carriage, amember movably mounted in said rear toolv carriage, a member onsa-idfront tool carriage engaging said movably mounted member. anoperative connection between said rear tooll and said? movably mountedmember, whereby motion said front carriage past said rear carriage willautomatically actuate said rear tool, and additional independent meansfor" adjusting` Vthe position of said rear tool both longitudinally andtransversely with respect to its carriage.

2. 1n a lathe, in combination, a front tool carriage, a cam on saidfront tool carriage, a rear carriage adapted to be clamped injadjfustedlongitudinal position ou thelathe bed, a rear-tool on saidl rear arriageand transversely slidable thereon. a movable member in said rearcarriage adapted to' enga-ge the face of said cam,- an operativeconnection between said'cannengaging member and said tool,resilientmeans maintaining said camengaging member in contact with-saidcam` and additional independent means for adjusting the position ofsaidA rear tool both longitudinally and transversely with respect toitsncarriage.

3. ln a lathe,- in con'ibiuation, ai), cutting tool on the roar side ofthe lathe adapt-ed to operate on the rear side of the material, a framelongitudinally slidaole on the lathe bed carrying said tool, means forclamping said frame in adjusted position on said lathe TSO bed, a secondquickly releasable means for adjusting said tool longitudinally, andmeans carried by said frame for feeding said tool transversely.

4. In a lathe, in combination, a tool carriage, a transversely slidablemember on said tool carriage, a transversely slidable tra-nsmissioiimember in said carriage, a rotatable member contacting with each of saidtransversely slidable members and adapted to transmit motion betweenthem, a tool on one of said transversely slidable members, resilientmeans acting on one of said members to press said tool in a givendirection,

and manually actuated means for positively actuating` said members ineither direction.

5. In a lathe, in combination, a tool carriage, a transversely slidablemember on said tool carriage, a transversely slidable transmissionmember iii sai-d carriage, a rotatable meinbercontacting With each ofsaid transversely slidable members and adapted to transmit motionbetween them, a tool on one of said transversely slidable members,resilient means acting on one of said members to press said tool in agiven direction, contact means positively actuating said meinbersagainst the force of said spring, and additional independentmeans foradjust-ing the longitudinal and transverse positions of tlie'tool on theslidable member Which carries it.

G. A lathe having, in combination, a front ing said rear tool from adefinite position onA the rear carriage to another definite position onthe rear carriage during a ypredetermined 'port-ion of the movement ofthe front tool carriage, and a cross feed screw interpolated in theconnection between the front tool carriage and the rear tool forprecisely adjust- `ing the, position of the rear tool Without disturbingthe automatic connection.Y

8. A lathe having, in combination, a plurality-of sets of Ways, acarriage on one set of Ways, means for clamping saidv carriage inlongitudinally adJu'sted position, a tool r on said carriage slidable ona horizontal axis, a cross feed screw for sliding said'tool,

a Vfront tool carriage vslidable past said first mentioned carriage, andan automatic connection for actuating said rear tool from said fronttool carriage.

In testimony whereof I havehereunto set my hand. I l GUSTAFDAVIDSUNDSTBAND.

